<!DOCTYPE html>
<html>

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title>后台管理系统</title>
<link rel="stylesheet" type="text/css" href="/static/lib/admin-assets/layui/css/layui.css" />
<link rel="stylesheet" type="text/css" href="/static/lib/admin-assets/css/login.css" />

<!-- 验证码-->
<script src="/static/lib/jquery3.6.0/jquery-3.6.0.min.js"></script>
<style>
    .code {
        width: 100%;
        margin: 0 auto;
    }
    .input-val {
        width: 63%;
        background: #ffffff;
        height: 2.8rem;
        padding: 0 2%;
        border-radius: 5px;
        border: none;
        border: 1px solid rgba(0,0,0,.2);
        font-size: 0.9rem;
    }
    #canvas {
        float: right;
        display: inline-block;
        border: 1px solid #ccc;
        border-radius: 5px;
        cursor: pointer;
    }
</style>
<script>
    // 创建验证码
    function createCaptcha(){
        let show_num = draw().join('');
        sessionStorage.setItem("verify_captcha",show_num)
    }
    // 绘制验证码
    function draw() {
        let show_num = [];
        var canvas_width = $('#canvas').width();
        var canvas_height = $('#canvas').height();
        var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
        var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
        canvas.width = canvas_width;
        canvas.height = canvas_height;
        var sCode = "A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
        var aCode = sCode.split(",");
        var aLength = aCode.length;//获取到数组的长度

        for (var i = 0; i <= 3; i++) {
            var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
            var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
            var txt = aCode[j];//得到随机的一个内容
            show_num[i] = txt.toLowerCase();
            var x = 10 + i * 20;//文字在canvas上的x坐标
            var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
            context.font = "bold 23px 微软雅黑";

            context.translate(x, y);
            context.rotate(deg);

            context.fillStyle = randomColor();
            context.fillText(txt, 0, 0);

            context.rotate(-deg);
            context.translate(-x, -y);
        }
        for (var i = 0; i <= 5; i++) { //验证码上显示线条
            context.strokeStyle = randomColor();
            context.beginPath();
            context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
            context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
            context.stroke();
        }
        for (var i = 0; i <= 30; i++) { //验证码上显示小点
            context.strokeStyle = randomColor();
            context.beginPath();
            var x = Math.random() * canvas_width;
            var y = Math.random() * canvas_height;
            context.moveTo(x, y);
            context.lineTo(x + 1, y + 1);
            context.stroke();
        }
        return show_num;
    }
    // 获取随机颜色
    function randomColor() {//得到随机的颜色值
        var r = Math.floor(Math.random() * 256);
        var g = Math.floor(Math.random() * 256);
        var b = Math.floor(Math.random() * 256);
        return "rgb(" + r + "," + g + "," + b + ")";
    }
</script>
<script async>
    $(function(){
        createCaptcha();
    })
</script>

<style>
    #a-link{
        color:#b8b8b8;
        position: absolute;
        bottom:15px;
        right:50px;
    }
    #a-link:hover{
        color:#1f1f1f;
    }
</style>
</head>

<body>
<div class="m-login-bg">
    <div class="m-login">
        <h3>后台管理系统</h3>
        <div class="m-login-warp">
            <form class="layui-form">
                <input type="hidden" name="<?php echo csrf_token();?>" value="<?php echo csrf_hash();?>">
                <div class="layui-form-item">
                    <input type="text" name="username" required lay-verify="required" placeholder="用户名" autocomplete="off" maxlength="20" class="layui-input">
                </div>
                <div class="layui-form-item">
                    <input type="text" name="password" required lay-verify="required" placeholder="密码" autocomplete="off" maxlength="18" class="layui-input">
                </div>
                <div class="layui-form-item">
                    <div class="layui-inline">
                        <input type="text" name="verify" required lay-verify="required" placeholder="验证码" autocomplete="off" maxlength="4" class="layui-input">
                    </div>
                    <div class="layui-inline">
                        <canvas  class="verifyImg" id="canvas" width="150" height="60" onclick="createCaptcha()"></canvas>
                    </div>
                </div>
                <div class="layui-form-item m-login-btn">
                    <div class="layui-inline">
                        <button class="layui-btn layui-btn-normal" lay-submit lay-filter="login">登录</button>
                    </div>
                    <div class="layui-inline">
                        <button type="reset" class="layui-btn layui-btn-primary">重置</button>
                    </div>
                </div>
                <a href="/register" id="a-link">新用户注册</a>
            </form>
        </div>
    </div>
    <p class="copyright" style="position:absolute;bottom:10px;color:white;text-align: center;width: 100%">Copyright 2015-2016 by XIAODU</p>
</div>
<script src="/static/lib/admin-assets/layui/layui.js" type="text/javascript" charset="utf-8"></script>
<script>
    layui.use(['form', 'layedit', 'laydate'], function() {
        var form = layui.form(),
            layer = layui.layer;

        //监听提交
        form.on('submit(login)', function(data) {
            let {username,password,verify} = data.field;
            let verify_captcha = sessionStorage.getItem('verify_captcha')
            // 表单验证
            if(!username || username.length<2){
                layer.msg("用户名的长度不能少于2个字符")
                return false;
            }
            if(!password || password.length<6){
                layer.msg("密码的长度不能少于6个字符")
                return false;
            }
            if(!verify || verify.length!=4){
                layer.msg("验证码必须是4个字符")
                return false;
            }
            if( verify.toLowerCase() != verify_captcha){
                layer.msg("验证码不正确")
                return false;
            }
            // 提交表单
            $.ajax({
                url:"<?=route_to('doLogin')?>",
                method:'post',
                data:data.field,
                success:function(res){
                    res = JSON.parse(res)
                    layer.msg(res.msg);
                    if(res.code == 200){
                        setTimeout(()=>{
                            location.href="/index";
                        },1000)
                    }
                }
            })

            return false;
        });

    });
</script>
</body>

</html>